Power supply unit



FIG. 1 is a top left front perspective view of a power supply unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings represent unclaimed environment only and form. no part of the claimed design. 

CLAIM The ornamental design for a power supply unit, as shown and described. 